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<! $Id: Prob.3,v 1.1 1996/07/13 01:35:40 stolcke Exp $><HTML><HEADER><TITLE>Prob</TITLE><BODY><H1>Prob</H1><H2> NAME </H2>Prob - Probabilities for SRILM<H2> SYNOPSIS </H2><B> #include <Prob.h> </B><H2> DESCRIPTION </H2><B> Prob </B>is a collection of types, constants and utility functions for handlingprobabilities in the SRILM library.<H2> TYPES </H2><DL><DT><B> Prob </B><DD>A floating point number representing a probability.<DT><B> LogP </B><DD>Logarithm to base 10 of a probability.</DD></DL><H2> CONSTANTS </H2><DL><DT><B> LogP_Zero </B><DD>Log of probability 0.<DT><B> LogP_Inf </B><DD>Log of probability infinity (not a legal probability, of course).<DT><B> LogP_One </B><DD>Log of probability 1.<DT><B> LogP_Precision </B><DD>The number of significant digits in a LogP<DT><B> Prob_Epsilon </B><DD>A positive value close to 0; probability sums less than this should beconsidered effectively zero.</DD></DL><H2> FUNCTIONS </H2><DL><DT><B> Boolean parseLogP(const char *<I>string</I>, LogP &<I>prob</I>) </B><DD>Converts a floating point string representation into a LogP.Returns<B> true </B>iff the number was parsed correctly.This function should be much faster than generic C library functionsfor floating point parsing.Also, it parses singular LogP's (plus/minus infinity) correctly.<DT><B> Prob LogPtoPPL(LogP <I>prob</I>) </B><DD>Converts a LogP into a perplexity (PPL).<DT><B> ProbToLogP(Prob \fPprob\fP) </B><DD>Converts a probability into a LogP.<DT><B> LogP MixLogP(LogP <I>prob1</I>, LogP <I>prob2</I>, double <I>lambda</I>) </B><DD>Computes the LogP resulting from interpolating two LogP's.If <I>p1</I> and <I>p2</I> are probabilities corresponding to <I>prob1</I>and <I>prob2</I>, respectively, then the result is the LogP correspondingto <I>lambda</I> * <I>p1</I> + (1 - <I>lambda</I>) * <I>p2</I>.</DD></DL><P>The following functions deal with <I>bytelogs</I>.Bytelogs are logarithms scaled to represent probabilties and likelihoodsas a short integer in SRI's DECIPHER(TM) recognizer(bytelog(<I>p</I>) = log(<I>p</I>) * 10000.5 / 1024).<DL><DT><B> double ProbToBytelog(Prob <I>prob</I>) </B><DD>Converts a probability to a bytelog.<DT><B> double LogPtoBytelog(LogP <I>prob</I>) </B><DD>Convert a LogP to a bytelog.<DT><B> LogP BytelogToLogP(double <I>bytelog</I>) </B><DD>Convert a bytelog to a LogP.</DD></DL><H2> SEE ALSO </H2><H2> BUGS </H2><H2> AUTHOR </H2>Andreas Stolcke <stolcke@speech.sri.com>.<BR>Copyright 1995, 1996 SRI International</BODY></HTML>⌨️ 快捷键说明
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